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I'm a New member who just purchased a used 2000 Outback (limited). The car has about 65,000 miles on it, runs great, passed inspection with flying colors before we bought it, but now, stalls out sporadically. These stall outs occur at random in terms of frequency (every other day or every couple of days), and only happen when the car is idling. I have noticed that the majority of stall outs occur after highway driving and once I come to a stop. It just slips down in RPMs and the engine stops. The car doesn't really shutter and sometimes I don't even realize I've stalled because it stalls so smoothly. That being said, all the dash lights come on once it stalls, and afterwards,it starts right back up without a problem.

We have taken the car to multiple mechanics including a subaru dealer who replaced the MAP sensor..didn't work. The other subaru specialist we saw suggested that there may be water in the engine that, in time, will make its way out?!? The most recent mechanic didn't think it was the idle control because when putting on the A/C the RPM's react as they should.

In any case, I was wondering if anyone has run into this sort of problem before or has any suggestions at all?!!? May the throttle body have something to do with it?

I appreciate any and all advice!

Thank you!
 

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2005 OBW 2.5L, 1989 Subaru Justy, RIP Blu
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7,355 Posts
I am wondering if it is a fuel pressure issue.

Have you started with a full tuneup? Also a 2000 is over due for a timing belt, as it is 106,000 miles OR 106 months. I would address that asap.A timing belt is more likely to jump when the engine is suddenly unloaded (decceleration or engine shut off). Thats not related to this, but you are way over due.
 

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03 H6 OBW & 06 WRX Sportwagon
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yeah, start with catching up on any overdue or missed maintenance. Include a throttlebody cleaning with the work.

Do you get a check engine light after the stall and what is the code?

and post your city in case someone can recommend a mechanic cause, one or two of yours are incompetent.
 

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Discussion Starter #4
I am in the los angeles area first off. And while I agree I should get more maintenance (aka tune up), the car for the most part runs well. The code that came up on the scan indicated that I needed a new MAP sensor. It was changed and still no help. The mechanic who last looked at it, said that the throttle body "looked clean" but does looking really confirm that it does not have unseen residue on it? Furthermore, may it be a faulty TPS?
 

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Onyx, 2008 LL Bean 3.0R and 2017 Honda Civic Hatchback Sport Touring
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TPS would throw a P0121, P0122, P1120 or another CEL DTC code. I'm the guy that asks the "stupid" questions: Have you recently changed gas stations? Have you tried using high octane? If it's a 3.0 H6 they seem to prefer higher octane gas. Maybe run a few tanks through with a detergent like gas additive. Or you could just keep throwing money at it until you are nickled and dimed with random parts. :)
 

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I'm a New member who just purchased a used 2000 Outback (limited). The car has about 65,000 miles on it, runs great, passed inspection with flying colors before we bought it, but now, stalls out sporadically. These stall outs occur at random in terms of frequency (every other day or every couple of days), and only happen when the car is idling. I have noticed that the majority of stall outs occur after highway driving and once I come to a stop. It just slips down in RPMs and the engine stops. The car doesn't really shutter and sometimes I don't even realize I've stalled because it stalls so smoothly. That being said, all the dash lights come on once it stalls, and afterwards,it starts right back up without a problem.

We have taken the car to multiple mechanics including a subaru dealer who replaced the MAP sensor..didn't work. The other subaru specialist we saw suggested that there may be water in the engine that, in time, will make its way out?!? The most recent mechanic didn't think it was the idle control because when putting on the A/C the RPM's react as they should.

In any case, I was wondering if anyone has run into this sort of problem before or has any suggestions at all?!!? May the throttle body have something to do with it?

I appreciate any and all advice!

Thank you!
This sounds like the exact same thing I have going on... Have you ever figured out what the issue was?
 

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2001 VDC/SC One of a Kind
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Bad grounding will do this.

On older cars, the main ground cable that runs from the battery to the engine will corrode under the insulation where you can't see it unless you cut it open. This corrosion is an inhibitor to electron flow and without ample amperage, you get stalling, hard starts, poor fuel economy, the engine may miss, multiple codes stored for sensors that ground from the engine harness and other odd things. With automatics, the transmssion will be effected.

The battery needs to be amp tested and the grounds, all of them, need to be verified as good and tight before checking sensor operation.
 

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2003 LL Bean Outback H6 and 2019 Outback Base
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514 Posts
Hey Cardoc,

Do you have a pic of where cable attaches to engine ?

I am confused on where this" insulation" is ?

much appreciated
 

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Outback H6 2003
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I'm a New member who just purchased a used 2000 Outback (limited). The car has about 65,000 miles on it, runs great, passed inspection with flying colors before we bought it, but now, stalls out sporadically. These stall outs occur at random in terms of frequency (every other day or every couple of days), and only happen when the car is idling. I have noticed that the majority of stall outs occur after highway driving and once I come to a stop. It just slips down in RPMs and the engine stops. The car doesn't really shutter and sometimes I don't even realize I've stalled because it stalls so smoothly. That being said, all the dash lights come on once it stalls, and afterwards,it starts right back up without a problem.

We have taken the car to multiple mechanics including a subaru dealer who replaced the MAP sensor..didn't work. The other subaru specialist we saw suggested that there may be water in the engine that, in time, will make its way out?!? The most recent mechanic didn't think it was the idle control because when putting on the A/C the RPM's react as they should.

In any case, I was wondering if anyone has run into this sort of problem before or has any suggestions at all?!!? May the throttle body have something to do with it?

I appreciate any and all advice!

Thank you!
mine does that too. It’s a outback 2003 H6 and i just changed the tps sensor, it still does that but way less and the car seems to be a bit more responding.
 
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